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master's thesis
Struktura i električna svojstva fosfatnih stakala s oksidima prijelaznih metala i alkalijskih elemenata
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. urn:nbn:hr:149:980532
Knežević, Andrea
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

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Knežević, A. (2024). Struktura i električna svojstva fosfatnih stakala s oksidima prijelaznih metala i alkalijskih elemenata (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:980532

Knežević, Andrea. "Struktura i električna svojstva fosfatnih stakala s oksidima prijelaznih metala i alkalijskih elemenata." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. https://urn.nsk.hr/urn:nbn:hr:149:980532

Knežević, Andrea. "Struktura i električna svojstva fosfatnih stakala s oksidima prijelaznih metala i alkalijskih elemenata." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. https://urn.nsk.hr/urn:nbn:hr:149:980532

Knežević, A. (2024). 'Struktura i električna svojstva fosfatnih stakala s oksidima prijelaznih metala i alkalijskih elemenata', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 26 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:980532

Knežević A. Struktura i električna svojstva fosfatnih stakala s oksidima prijelaznih metala i alkalijskih elemenata [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2024 [cited 2024 November 26] Available at: https://urn.nsk.hr/urn:nbn:hr:149:980532

A. Knežević, "Struktura i električna svojstva fosfatnih stakala s oksidima prijelaznih metala i alkalijskih elemenata", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:149:980532

Metadata
TitleStruktura i električna svojstva fosfatnih stakala s oksidima prijelaznih metala i alkalijskih elemenata
Title (english)Structure and electrical properties of phosphate glasses with transition metal and alkali oxides
AuthorAndrea Knežević
MentorKatarina Mužina (mentor)
MentorAna Šantić (komentor)
Committee memberKatarina Mužina (predsjednik povjerenstva)
Committee memberJelena Macan (član povjerenstva)
Committee memberAna Šantić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2024-09-30, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
U uvjetima stalno rastuće potrošnje energije važnu ulogu u ljudskom životu imaju elektrokemijski uređaji, a posebno litij- i natrij-ionske baterije. Pri tome je razumijevanje odnosa strukture i električnih svojstava materijala ključno za njihov razvoj. U tu svrhu su metodom naglog hlađenja taline pripravljena fosfatna stakla množinskog sastava 30Na2O-xFe2O3-(30-x)WO3-40P2O5 i 30Li2O-xFe2O3-(30-x)WO3-40P2O5; x = 0-30 %, te je impedancijskom spektroskopijom ispitana njihova električna provodnost. Za obje serije stakala dobiven je nemonotoni trend istosmjerne električne provodnosti s minimumom pri 20 % množinskog udjela Fe2O3, nakon čega dolazi do ponovnog porasta električne provodnosti. Smanjenje ionske vodljivosti povezano je s promjenama strukturne mreže, odnosno pokretljivost iona alkalijskih oksida (Na+ i Li+) smanjuje se zbog njihove povećane interakcije s depolimeriziranom strukturom fosfatnog stakla i formiranja kompaktne umrežene strukturne mreže stakla. Kod svih je stakala utvrđen dominantno ionski mehanizam vodljivosti, a kod stakala s 30 % množinskog udjela Fe2O3 dokazana je miješano ionsko-polaronski transport zbog značajnog doprinosa polaronske vodljivosti putem prijenosa elektrona između iona željeza.
Abstract (english)
In conditions of constantly growing energy consumption, electrochemical systems, especially lithium- and sodium-ion batteries, play an important role in human life. Therefore, understanding the relationship between the structure and electrical properties of materials is crucial for their development. For this purpose, phosphate glasses of the composition 30Na2O-xFe2O3-(30-x)WO3-40P2O5 and 30Li2O-xFe2O3-(30-x)WO3-40P2O5; x = 0-30 mol% were prepared by the melt-quenching technique, and their electrical conductivity was studied by impedance spectroscopy. For both series of glasses, a non-monotonic trend of DC conductivity was obtained with a minimum at 20 mol% of Fe2O3, after which the electrical conductivity increases. The decrease in ionic conductivity is associated with changes in the structural network, that is, the mobility of alkali oxide ions (Na+ and Li+) decreases due to their increased interaction with the depolymerized phosphate glass structure and formation of the compact crosslinked glass network structure. While the ionic conductivity mechanism is dominant in all glasses, in glasses with 30 mol% Fe2O3 a significant contribution of polaronic conductivity through electron transfer between iron ions has been proven.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:980532
Study programmeTitle: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry
Course: Environmental chemistry and green technologies
Study programme type: university
Study level: graduate
Academic / professional title: sveučilišni/a magistar/magistra primijenjene kemije (sveučilišni/a magistar/magistra primijenjene kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2024-11-11 12:45:11